63 lines
1.9 KiB
JavaScript
63 lines
1.9 KiB
JavaScript
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/**
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* Copyright 2019 Paul Reed
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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**/
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// Many thanks to @bartbutenaers for the learning experience & support!!
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module.exports = function(RED) {
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function Watt2kWhNode(config) {
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RED.nodes.createNode(this,config);
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this.maximum = config.maximum;
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var node = this;
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//Read the selected output format
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const formats = {"j":1e-3, "kj": 1, "wh": 3.6, "kwh": 3600, "mwh": (1e3*3600)};
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this.output = formats[config.format] || 0;
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//Read the selected timeout value
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const units = {"secs": 1, "mins": 60, "hours": 3600};
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this.maximum *= units[config.maximumunit] || 0;
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// Overule if left blank or negative values selected
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if (this.maximum <= 0) {
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this.maximum = 3600;
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}
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node.on('input', function(msg) {
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var kwatts = (msg.payload / 1000);
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var hrtime = process.hrtime();
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var secsnow = ((hrtime[0]) + (hrtime[1] / 1e9));
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var lastms = node.lastms||secsnow;
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var interval = secsnow - lastms;
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// Check if input msg is a number, else warn & exit
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if (isNaN (kwatts)){
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this.error("The input msg is not a number");
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return;
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}
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node.lastms = secsnow;
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// Calculate kilojoules from energy - if interval is OK
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if ((interval < this.maximum)&&(interval !== 0)) {
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msg.payload = (interval*kwatts)/this.output;
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node.send(msg);
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} else {
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return;
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}
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});
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}
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RED.nodes.registerType("watt2kwh",Watt2kWhNode);
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}
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